From rkim@cmu.edu Sun Feb 12 02:31:31 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cmu!rkim From: rkim@cmu.edu (Rodrigo Kim) Newsgroups: comp.dsp Subject: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Feb12.023131.6897@cmu.edu> Date: Sun, 12 Feb 1995 02:31:31 GMT Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 10 Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. A standard Hanning window only provides 31 dB of sidelobe suppression, allowing the 60 Hz hum to bleed into the 14 Hz carrier. What sampling rates are people using for their vinyl rips? 44.1 kHz or 48 kHz DAT? -- Rodrigo Kim Tape trading list upon request. SASE required for international mail. From nnilsson@cern.ch Sun Feb 12 17:40:31 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!cern!nnilsson From: nnilsson@cern.ch (Nadine Nilsson) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Feb12.174031.9886@cern.ch> Date: Sun, 12 Feb 1995 17:40:31 GMT References: <1995Feb12.023131.6897@cmu.edu> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Feb12.023131.6897@cmu.edu>, rkim@cmu.edu (Rodrigo Kim) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Nadine Nilsson | nnilsson@cern.ch PGP Key fingerprint: 9DFA 2ED9 121D 8220 "Keep the channels open." From hsokolov@pacbell.net Tue Feb 14 07:54:31 1995 Path: ashpoly!cascade!bigsur!pacbell!hsokolov From: hsokolov@pacbell.net (Hugo Sokolov) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Feb14.075431.7133@pacbell.net> Date: Tue, 14 Feb 1995 07:54:31 GMT References: <1995Feb12.023131.6897@cmu.edu> <1995Feb12.174031.9886@cern.ch> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Feb12.174031.9886@cern.ch>, nnilsson@cern.ch (Nadine Nilsson) writes: > I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. Excellent advice on the Blackman-Harris window. Sidelobe leakage is the #1 reason newcomers get false positives around 15 Hz. -- Hugo Sokolov "Do not worship the copy." Atari Falcon 030 / System 7.5.1 From fsantos@cam.ac.uk Wed Feb 15 20:48:31 1995 Path: ashpoly!cascade!transat!ukc!fennimore!cam!fsantos From: fsantos@cam.ac.uk (Freya Santos) Newsgroups: comp.dsp Subject: Re: WTB/WTT: Sidelobe leakage in Blackman-Harris vs Kaiser-Bessel windows for sub-carrier Message-ID: <1995Feb15.204831.7390@cam.ac.uk> Date: Wed, 15 Feb 1995 20:48:31 GMT References: <1995Feb12.023131.6897@cmu.edu> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Feb12.023131.6897@cmu.edu>, rkim@cmu.edu (Rodrigo Kim) writes: > Comparing window sidelobe attenuation on 16-bit 44.1 kHz WAV files. > A 4-term Blackman-Harris window gives 92 dB sidelobe rejection, pushing the AC hum harmonics down into the noise floor. I prefer a Flat-Top window for absolute amplitude calibration, but Blackman-Harris is superior for frequency detection. -- Freya Santos *PLONK* filter active for trolls. 486DX4/100 (FreeBSD 2.0.5) - NetBSD 1.0